The Cycle of Cosmic Catastrophes:
Flood, Fire, and Famine
in the History of Civilization
by Richard Firestone,
Allen West, and
Simon Warwick-Smith
IMO, ice ages are caused by large impact.”
I tend to agree, but I would also include monster volcanic events like Yellowstone, Long Valley, etc. I still want to know what big thing happened 125,000 years ago.